Have you ever spoken with a designer or audio engineer

There may be one---I'm sure Roger would prefer the owner of the Music Reference RM-9 that sent the amp in for repair (a result of the eight $49 Hi-Fi Tuning fuses the owner had installed on the output power tubes in the amp not performing as they should but don't---the very reason for Roger's warning about them) had spent spend the $400 ($400---on fuses?!) on more MR product rather than the fuses! Then there was the approximately $400 in replacement tubes and $350 to repair the amp, all because the Hi-Fi Tuning Fuses failed to act in the manner they are supposed to---to blow when they need to, the very reason for fuses. If you want a power amp without fused tubes, buy an Audio Research!

The design and construction of the Hi-Fi Tuning fuse prevents it from performing it's intended function when put in the signal path of an output power tube. And what's worse, the manufacturer does not appear to be aware of what performance characteristics a fuse must possess to make it appropriate for that application! That's all Roger's warning was about---very simple. If that's not of interest or significance to you, you're free to ignore the warning. But to impugn Roger Modjeski's intentions?

Bdp24......Roger Modjeski, apparently a polarizing figure here.....

My design career began at age 11 when I built my first 3 tube, class A single ended amplifier. I still have the thing that is capable of about 3 watts. Its description reads like a $5000 amplifier that the high-end magazines might cover today. Should I send it in for review ?

Bdp24
There may be one---I’m sure Roger would prefer the owner of the Music Reference RM-9 that sent the amp in for repair (a result of the eight $49 Hi-Fi Tuning fuses the owner had installed on the output power tubes in the amp not performing as they should but don’t---the very reason for Roger’s warning about them) had spent spend the $400 ($400---on fuses?!) on more MR product rather than the fuses!

After installing my select brand of low noise resistors as applied in the critical sections of your rm10, the noise faded into oblivion. Many of the current audiophile resistors are chosen on the basis of their high price or exotic materials. Often by people who do not understand noise mechanisms. Their makers are often concerned with precision and other characteristics that non-audio related applications require . I have not found low noise to be one of them. Lesson two, expensive resistors are not always the best.

Around 1964 my interest and the industry’s turned to the new miracle transistors. I, in my basement shop, and the giants of the industry both did our best to design good sounding amplifiers with these new devices and we all failed.

When a 15 year old kid has to redesign flaws out of a professional product, something is wrong, or maybe something is right and is inspiring me to make better designs. I also had no idea at that time what a manufacturer had to go through to get a product out at a price with good service.

On the bench I saw what every amplifier designer before me has seen. crank up the tube current and the distortion goes down. Sadly tube life goes down faster than the distortion.